AQA GCSE Physics

Revision Notes

2.3.6 Use of Transformers

Use of Transformers

  • The type of current produced in power stations is alternating current (AC) which is transferred through to homes via the National Grid
  • Transformers are used to increase and decreases the potential difference of the AC electricity before and after transmission across the National Grid
  • They are formed of two coils of wire, called the primary and secondary coils, around a magnetic iron core
    • A step-up transformer has more turns on the secondary coil than the primary
    • A step-down transformer has more turns on the primary coil than the secondary

Transformer Diagram, downloadable AS & A Level Physics revision notes

A step-up transformer

  • Step-up transformers are used to increase the potential difference from the power station to the transmission cables
  • Step-down transformers are used to decrease the potential difference, to a much lower value, from transmission cables for domestic use (houses, offices, shops)

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